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If 7 orchids cost d dollars, then how many dollars will 10 orchids cos

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Math Expert
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Joined: 02 Sep 2009
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If 7 orchids cost d dollars, then how many dollars will 10 orchids cos  [#permalink]

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New post 05 Feb 2019, 04:25
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

93% (00:31) correct 7% (01:03) wrong based on 14 sessions

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Concentration: Sustainability, Marketing
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WE: Marketing (Energy and Utilities)
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Re: If 7 orchids cost d dollars, then how many dollars will 10 orchids cos  [#permalink]

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New post 05 Feb 2019, 06:02
price per orchid * 7 = d
price per orchid = d/7
10 orchids= 10d/7
IMO D

Bunuel wrote:
If 7 orchids cost d dollars, then how many dollars will 10 orchids cost at the same rate?


A. 70d

B. 70/d

C. 7/(10d)

D. 10d/7

E. d/70
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Re: If 7 orchids cost d dollars, then how many dollars will 10 orchids cos  [#permalink]

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New post 06 Feb 2019, 01:32
Bunuel wrote:
If 7 orchids cost d dollars, then how many dollars will 10 orchids cost at the same rate?


A. 70d

B. 70/d

C. 7/(10d)

D. 10d/7

E. d/70



7 orchids cost d dollars

1 orchid costs d/7 dollar

10 orchids cost 10d/7 dollars.

D is the correct answer.
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Re: If 7 orchids cost d dollars, then how many dollars will 10 orchids cos  [#permalink]

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New post 06 Feb 2019, 19:43
Bunuel wrote:
If 7 orchids cost d dollars, then how many dollars will 10 orchids cost at the same rate?


A. 70d

B. 70/d

C. 7/(10d)

D. 10d/7

E. d/70



Using a proportion, we have:

7/d = 10/n

7n = 10d

n = 10d/7

Answer: D
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Re: If 7 orchids cost d dollars, then how many dollars will 10 orchids cos   [#permalink] 06 Feb 2019, 19:43
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